[mpich-discuss] how to dynamically schedule process in mpich

[Shuwei Zhao]

Hi Hui

I cannot run mpiexec directly on my hosts because both rsh and ssh
connections are disabled. I have to use qsub -P bnormal -pe dp 4 mpiexec
./my_exe to run my binary on remote hosts.

Thanks
Shuwei

On Wed, Nov 28, 2018 at 16:59 Zhou, Hui <zhouh at anl.gov> wrote:

> Hi Shuwei,
>
> Were you able to run over multiple hosts directly, e.g.:
>
> ```
> $ mpiexec -n 2 -hosts “hostname_1,hostname_2” ./cpi
> ```
> ?
>
> —
> Hui Zhou
>
>
>
>
>
>
>
>
> On Nov 28, 2018, at 3:33 PM, Shuwei Zhao <shuweizhao1991 at gmail.com> wrote:
>
> Hi hui
>
> I tried your suggestion but looks like the newly spawned jobs are using
> ssh to distribute on the new hosts. Howver In my machine farm, ssh & rsh
> connections are disabled. have to submit through qsub network interface. Is
> using qsub  possible in mpi_comm_spawn?
>
> Thanks a lot
> Shuwei
>
> On Mon, Nov 19, 2018 at 09:21 Zhou, Hui <zhouh at anl.gov> wrote:
>
>> On Sun, Nov 18, 2018 at 10:33:48PM -0600, Shuwei Zhao wrote:
>> >2. About the MPI_Info object, I tried to use mpi_comm_spawn on the same
>> >machine, it can work. But I don't know how to spawn processes cross
>> >machines. For example, if I have 4 processes on machine 1, and I want to
>> >spawn 4 more processes on other machines (resource managed by qsub), how
>> do
>> >I need to declare in the MPI_Info object?
>>
>> Did you try setting the host parameter in the info object? For
>> example:
>>
>>     MPI_Info info;
>>     MPI_Info_create(&info, "host", "A,B,C");
>>
>>     MPI_Comm_spawn("worker", MPI_ARGV_NULL, n_hosts, info, 0,
>> MPI_COMM_SELF, &comm_workers, MPI_ERRCODES_IGNORE)?
>>
>>     MPI_Info_free(&info);
>>
>> Replace "A,B,C" with host name list that you want to spawn process on.
>>
>> --
>> Hui Zhou
>>
>
>
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